The Oracle's software has been downloaded from Oracle's webpage and
copied into a CD.

I 've created (and formatted) a 18Gb NTFS partition on my HDD in order
to make a clean install.

After formatting the HDD I've created de Windows XP Pro SP1 partition
with an administrator account and a user account. Once windows
installation has finished I've copied into the HDD the Oracle's
software I had burnt on the CD and I've launched it.

I've chosen the Personal Edition installation and I've created a
started database with schema examples.

When the installation has finished I've gone to
http://localhost:5500/em and created a user ("USER1") to access the
ORCL starter database. I've given this user almost each role and
privilege I've been able to.

Also I've created a 'Local Net Service Name' (the 3rd option in the Net
configuration assistant) with the "Net Configuration Assistant". The
name of this service name has been orcl so that it matches the started
db name. As user/password I've used the ones I has previously created
on the 'Enterprise Manager'.

The problem comes when I reboot twice the PC and I realize that I
cannot access the http://localhost:5500/em anymore. I've checked the
Oracle services on 'Administrative Tools' from 'Control Panel' and I've
found the following list:

Some of them were running and some of them not, so I've launched the
whole bunch of them (OracleCSSService has had a 'starting' status the
whole time). I've tried again to connect to http://localhost:5500/em
but, Unfortunately, I've not succeeded ('Cannot Show Page' Error on
IExplorer /'Connection Refused Error' on Firefox).

Since Oracle's installation finished, I have had access the whole time
to SQL*Plus, iSQL*Plus (and even SQLTools) but the Enterprise Manager
seems to be dead after two reboots (after the first reboot it worked
fine, althoug it spent a lot of time to load on IE).